Dressed in a pink Gucci tuxedo suit with black lapels over a white button-up shirt, Blue was first greeted by Rihanna, who was up for eight GRAMMY awards, including Record of the Year.

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In between commercial breaks, James Corden also made his way over to Blue, who she shared a few high-fives with.

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And, it looks like she took a liking to the GRAMMY host, as she later joined him during an impromptu musical performance of "Sweet Caroline," along with John Legend, Faith Hill, Tim McGraw, Keith Urban, Neil Diamond and Jennifer Lopez.

LOS ANGELES, CA - FEBRUARY 12: James Corden and Jennifer Lopez during The 59th GRAMMY Awards at STAPLES Center on February 12, 2017 in Los Angeles, California. (Photo by Kevin Mazur/Getty Images for NARAS)

Recording artists Josh Dun (L) and Tyler Joseph of music group Twenty One Pilots accept the Best Pop Duo/Group Performance award for 'Stressed Out' onstage during The 59th GRAMMY Awards at STAPLES Center on February 12, 2017 in Los Angeles, California.

(Photo by Kevin Winter/Getty Images for NARAS)

Actor John Travolta speaks onstage during The 59th GRAMMY Awards at STAPLES Center on February 12, 2017 in Los Angeles, California.

Musicians Peter Martin (L) and Robert Dillon of Third Coast Percussion onstage at the Premiere Ceremony during the 59th GRAMMY Awards at Microsoft Theater on February 12, 2017 in Los Angeles, California.

(Photo by Rich Polk/WireImage)

Producers Juliette Larthe (L) and Nathan Scherrer accept the Best Music Video award for 'Formation' onstage at the Premiere Ceremony during the 59th GRAMMY Awards at Microsoft Theater on February 12, 2017 in Los Angeles, California.

(Photo by Rich Polk/WireImage)

Host James Corden onstage during The 59th GRAMMY Awards at STAPLES Center on February 12, 2017 in Los Angeles, California.

LOS ANGELES, CA - FEBRUARY 12: James Corden and Jennifer Lopez during The 59th GRAMMY Awards at STAPLES Center on February 12, 2017 in Los Angeles, California. (Photo by Kevin Mazur/Getty Images for NARAS)

LOS ANGELES, CA - FEBRUARY 12: Jay Z and Beyonce during The 59th GRAMMY Awards at STAPLES Center on February 12, 2017 in Los Angeles, California. (Photo by Kevin Mazur/Getty Images for NARAS)

LOS ANGELES, CA - FEBRUARY 12: Musician Dave Mustaine (L) and David Ellefson of Megadeth accepts the Best Metal Performance award for 'Dystopia' onstage at the Premiere Ceremony during the 59th GRAMMY Awards at Microsoft Theater on February 12, 2017 in Los Angeles, California. (Photo by Rich Polk/WireImage)

LOS ANGELES, CA - FEBRUARY 12: Songwriters Adele Adkins (L) and Greg Kurstin accept the Song Of The Year award for 'Hello' onstage during The 59th GRAMMY Awards at STAPLES Center on February 12, 2017 in Los Angeles, California. (Photo by Kevin Winter/Getty Images for NARAS)